Hex socket head cap screw(Nihon Fastener Kogyo(Coarse Steel Unplated 18 X 55 Pitch 2.5
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This is a bolt with a cylindrical head featuring a hexagonal socket.
Tightening is performed using a hex key (Allen wrench). Although classified as a bolt, it is most commonly used without a nut.
It is also known as a cap screw or socket screw.
Spanners and wrenches with jaws used to tighten hex bolts require clearance space around the work area, whereas a hex key does not.
Therefore, the use of hex socket head cap screws enables work in confined spaces and contributes to the miniaturization of machinery.
Their appearance has also led to increasing use in design-oriented applications.
Cap Bolt

This is a bolt with a cylindrical head featuring a hexagonal socket.
Tightening is performed using a hex key (Allen wrench). Although classified as a bolt, it is most commonly used without a nut.
It is also known as a cap screw or socket screw.
Spanners and wrenches with jaws used to tighten hex bolts require clearance space around the work area, whereas a hex key does not.
Therefore, the use of hex socket head cap screws enables work in confined spaces and contributes to the miniaturization of machinery.
Their appearance has also led to increasing use in design-oriented applications.
Cap Bolt
Product Details

- Hex socket head cap screw, Nihon Fastener Kogyo, Coarse pitch
- Nominal diameter (d): M18
- Length under head (ℓ): 55.0
- Pitch (P): 2.5
- Thread length (b): Reference 48
- Head diameter (dk): Nominal 27, Max 27.33, Min 26.67
- Neck diameter (da): Max 20.2
- Body diameter (ds): Nominal 18, Min 17.73
- Head height (k): Nominal 18, Min 17.57
- Neck fillet (r): Min 0.8
- Hex socket width across flats (S): Nominal 14.0, Max 14.212, Min 14.032
- Hex socket depth (t): Min 9
- Head chamfer (v): Max 1.8
Hex socket head cap screw(Nihon Fastener Kogyo(Coarse Steel Unplated 18 X 55 Pitch 2.5
| Steel | Unplated | 18 X 55 | Individual sale | View Details |
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